Duckey - iOS keyboard for sending animated stickers
Dango - Use emoji, stickers & gifs faster 😄 💬
StickerPop API - Embed all the best stickers and GIFs into your apps.
Antiselfie club - Take a photo and get a antiselfie.
SketchKeys - Learn Sketch shortkeys easily w/ keyboard stickers
Deconditioning Stickers - Stickers designed to mess with your notification addiction